Light Control Switch Circuit

LIGHTING: LIGHTING SYSTEM: Light Control Switch Circuit
- Light Control Switch Circuit

DESCRIPTION

The combination switch ECU (windshield wiper switch assembly) receives the following switch information:

* Light control switch position is Off, Tail, Head, or Auto

* Headlight dimmer switch position is High, Low, or Flash (Pass)

* Turn signal switch position is LH, RH, or Off

* Fog light switch position is On or Off

The combination switch ECU then converts these signals to BEAN signals and sends them to each ECU via the multiplex communication system.

The headlight dimmer switch assembly includes the light control, headlight dimmer, turn signal, and fog light switches.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT
Before starting the procedure, check that the multiplex communication system DTCs are not output Diagnostic Trouble Code Descriptions.

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Switch / Data List.

(e) Read the display on the Techstream.

Combination Switch (Combination Switch ECU):

Combination Switch (Combination Switch ECU)::

OK:

Condition information can be displayed.

NG -- INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

HINT
Inspect the items that did not change as a result of monitoring the DATA LIST.

(a) Remove the headlight dimmer switch assembly.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

Light Control Switch
Headlight Dimmer Switch
Turn Signal Switch
Fog Light Switch

NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR

(a) Disconnect the J26 windshield wiper switch assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY